std::char_traits::to_int_type

 

C++

Language

Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Strings library

Null-terminated strings

Byte strings

Multibyte strings

Wide strings

Classes

basic_string

basic_string_view (C++17)

char_traits

 

std::char_traits

Member functions

char_traits::assign

char_traits::cmp

char_traits::move

char_traits::copy

char_traits::compare

char_traits::length

char_traits::find

char_traits::to_char_type

char_traits::to_int_type

char_traits::eq_int_type

char_traits::eof

char_traits::not_eof

 

static int_type to_int_type( char_type c );		(until C++11)
static constexpr int_type to_int_type( char_type c );		(since C++11)

Converts a value of char_type to int_type.

Parameters

c

-

value to convert

Return value

A value equivalent to c.

Exceptions

(none)	(until C++11)
noexcept specification:   noexcept	(since C++11)

Complexity

Constant.

Notes

For every valid value of char_type, there must be a unique value of int_type distinct from eof(). For example, a common implementation of char_traits<char>::eof() is return -1, and a corresponding valid implementation of char_traits<char>::to_int_type(c) is return (unsigned char)c.